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California Regional Water Quality Control Board °` °: <br /> Central Valley Region <br /> Robert Schneider,Chair " <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 'llnD <br /> U�� ���D <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-300 �J <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 27 November 2002 D E C Q 3 2OO2 <br /> Tony Arnaiz ENVIRONMENT HEALTH <br /> Central Valley Construction PERMIT/SERVICES <br /> PO Box 830 <br /> Lathrop,CA 95330 <br /> SITE CLOSURE REVIEW AND REQUEST MONITORING WELL DESTRUCTION WORKPLAA;- - <br /> CENTRAL VALLEY CONSTRUCTION, 146 KLO ROAD,LATHROP,SANJOAQUIN COUNTY <br /> I reviewed the 20 October 2002 Fourth Quarterly Report(Q4-2002 Report) and the 20 November 2002 File <br /> Closure Report(Closure Report) submitted by John Cummings &Associates (JCA)on behalf of Central Valley <br /> Construction. The Q4-2002 Report presents monitoring and sampling data for three monitoring wells and one <br /> domestic well in September 2002, and the Closure Report presents a summary of investigation and remedial <br /> activities and a site closure request. <br /> The on-site domestic well and the three on-site monitoring wells were sampled on 17 September 2002. The <br /> depth to water was approximately 15 feet below ground surface, and the groundwater flow direction was to the <br /> northeast at 0.002 feet/foot. The water samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg) and diesel (TPHd),benzene, toluene, ethyl benzene, and total xylenes (BTEX). The on-site domestic <br /> well and the three monitoring wells were non-detect for all constituents at appropriate detection limits. This was <br /> the fourth groundwater monitoring event since the monitoring wells were first installed and sampled in <br /> November 2001. <br /> Based on these non-detect concentrations of petroleum hydrocarbon contaminants in groundwater, JCA requests <br /> site closure. We concur with your request for site closure. By 31 December 2002,please submit a plan of work <br /> to properly destroy the three monitoring wells. All work must be completed in accordance with State and local <br /> laws,including obtaining an appropriate San Joaquin County Environmental Health Department well destruction <br /> permit. Once we receive a letter report documenting that wells have been properly abandoned(removed and/or <br /> destroyed), we can proceed with our site closure process. <br /> Please notify me at least five business days prior to any site work or sampling. If you have any questions or <br /> comments,please call me at(916) 255-3115. <br /> Marty Hartzell,R.G. <br /> Associate Engineering Geologist <br /> cc: Ms.Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. John Cummings, John Cummings &Associates,Fremont <br /> California Environmental Protection Agency <br /> Ca Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />